The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 2004
Filed:
Sep. 28, 2001
Masato Murata, Toshima-ku, JP;
Naruhiko Kudo, Toshima-ku, JP;
Sanyo Denki Co., Ltd., Tokyo, JP;
Abstract
A drive unit for a brushless motor capable of permitting a rotor to be reliably rotated in a normal or positive direction during starting of the motor. A power control circuit is so constructed that a power feed semiconductor switch may have turn-on time set to a level required or sufficient to permit the rotor to get out of a negative torque region during starting of the brushless motor and turn-off time set to a level sufficient to permit the rotor to race after lapse of the turn-on time. Starting operation by repeat of the turn-on time and turn-off time is carried out at the number of times required to rotate the rotor in a normal or positive direction.